21044625 has 32 divisors (see below), whose sum is σ = 40025856. Its totient is φ = 9619200.

The previous prime is 21044581. The next prime is 21044627. The reversal of 21044625 is 52644012.

It is not a de Polignac number, because 21044625 - 2⁸ = 21044369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21044595 and 21044604.

It is not an unprimeable number, because it can be changed into a prime (21044627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1384 + ... + 6633.

It is an arithmetic number, because the mean of its divisors is an integer number (1250808).

Almost surely, 2^21044625 is an apocalyptic number.

21044625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21044625 is a deficient number, since it is larger than the sum of its proper divisors (18981231).

21044625 is an equidigital number, since it uses as much as digits as its factorization.

21044625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8042 (or 8032 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 21044625 is about 4587.4420977272. The cubic root of 21044625 is about 276.0877031719.

Adding to 21044625 its reverse (52644012), we get a palindrome (73688637).

The spelling of 21044625 in words is "twenty-one million, forty-four thousand, six hundred twenty-five".